Portable amplifier for radio sets



May 19, 1925- I 1,538,865

H. P. PORTER PORTABLE AMPLIFIER FUR RADIO SETS Filed Oct. 1924 Patented May 19, 1 925.

UNI D, STATES PATENT OFFICE.

P. roman, or WASHINGTON, nisrmo'r or COLUMBIA.

remnants amrmrma'ron name snrsQ Application filed October as, 1924 Serial in. 746,320.

' vented 'certain' new and useful Improve ments' in Portable Amplifiers for Radio, Sets, of whichfthe following a specification.

This inventionrelates to a portable amplifying receiver especially designed to be utihzedin connection with the well known radio c stal'sets, and isparticularly directed to e augmentation of ,sound. as the latter ,is' taken from thezcustomar car pieces or sonorous body, and it is a The prime-ob ect of pdrtable radio sets with which the usual ear the invention is to provide simple," durable, economical and thoroughly. efiicientportable means for so amplifying and augmenting the sound waves emanating from the ear pieces of the ordinary'wellknown radio crystal sets that the sound will be thrown out so as to render -itclearly audible in all parts ofthe room in which the said radio set is installed.

Another object of the invention is to provide sound am lifying means which 1 will adapt itself to t e usual portable radio sets now employed in connection "with radio equipment without necessitating any changes in the construction of said sets.

' Another object ofthe invention is to provideamplifymg means including a sound amplifyingclmmber adapted to be so correlated and associated with an acoustical instrument which is surrounded in said cham ber, that the sound is propa ated from the acoustical instrument to t e amplifying chamber and caused to audibly emerge from the chamber.

A further object of the invention is to furnish amplifying means which is compact, portable and readily manufactured. while possessing increased qualities and characteristics over the more expensive amplifiers.

Still further objects'of the invention are to constructmy novelamplifier from a suitable materiahgwhioltwill eliminate all metallic and harsh sounds which usually emanate from acoustic instruments, and to so bly into a room with its natural'and pleasing tone, thus eliminating all extraneous and unnatural sounds.

The foregoing and such other objects as may appear" from the ensuing descri tion aited are accomplished by. the unitary means ereto be used inconn'ection witlrany an all;

inafter more fully described, shown in the accompanying drawings, and more particularly pointed out in the claims appended .here'to, it being understood that slight changes in the precise form, proportions and minor details .of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

In the accompanying drawings forming a part of this specification it will be seen Figure 1 is a side elevation of the novel unitary means embodying my invention.

Fi re 2 is a central longitudinal section showing a plurality of ear. pieces loosely placed therein.

Figure 3 is a side elevation of a slightly modified amplifying means. t 'Figure 4 is a central longitudinal section of the device shown in Fig. 8, showing a plurality of ear ieces' with their wire connections loosely eposited therein.

Figure 5 is a side elevation of another modified form of amplifier, and

Figure 6 is a central longitudinal section of the means shown in Fig. 5, showing a plurality of ear pieces loosely disposed therein. I

In the embodiment of my invention as illustrated, it will be seen thatFigs. 1 and 2 show one form of my novel unitary structure constltutlng sound amplifying and augmenting means preferably formed of crystal glass comprising a rounded or cylindrical body portion 1, a rear semi-circular I of the ear pieces .5, usuall solid deflecting wall 2,-'- and acontracted gradually sloping neckportion 3 which merges into the outwa y'flaring front or mouth portion 4. As is clearly shown in Fig. 2, it will be perceived that a plurality employed in coni I nection with portable ra i sets are loosely of the portable ra placed within the body portion of the amplifier, each pair of ear pieces being provided with the usual wire connections 6, and terminal metallicpins 7, the latter being adapted to be pro rly connected with any i o sets (not shown) now employed ingeneral use; The body portion 1 is preferably connected at the central portion thereof with a hollow upright member 8, merging at its lower end into an outwardly extended hollow base and supporting member 9, the said upright member'serving as ahandlefor the unitary structure,

- whereby it may be readily removed from'one location to another. I

An essential feature of theinvention is the provision of a ortable unitary device'whose walls due to t eir culiarly rounded and 7 gradually sloping ormationthereby eliminating all angles, shoulders, and like con- 1 structions, define a novelamplifying chamber, which when the customary acoustical receiving instruments of the ear piece t pe areloosely disposed within. said cham er, the correlation of said instruments. with thepeculiarly shaped chamber. and .theimaterial from which said chamber .is formed operates to produce or define therewith a sound propagation medium leading to the contracted rounded and sloping neck portion from.-

which the amplified sound emerges out of the flaring mouth portion in a clear, audible,. leasing and natural tone which is distinct-- y audible in allpartsofv the ,room within which the radio set is installed.

By reference to Figs. 3 and 4 of the drawings it will be observed that the modified.

form of device shown thereby consists of an elongated cylindrical body portion 10, having I a semi-circular rear wall 11, a well defined gradually sloping .and rounded contracted neck portion 12 with an outwardly'and forwardly flaredfront portion 13, an upright memberl centrally connected with the body portion. serving as a handle and a laterally extended-hollow base and supporting member 15, and with-in the body portion 10 thereof is loosely disposed a plurality of acoustical instruments or car pieces 16, to which pieces the usualwires 17 are connected, each set of ear pieces being provided with the cus tomary metallic radio set connections 18, as clearly shown in Fig.- 4. while the modification such as .shown in Figs. 5 and 6, comprises a spherical or globular body portion 19, a radually and smoothly curved contracted neck'portion 20. and an outwardly and forwardly flaring front or mouth porti! nuance I tion 21, To the central portion of the body {is connected an upright hollow member 20'. forming a handle therefor, which merges at its'lower and into hollow extended base. member 21', constitutingja support for. the device, and within-the body portion is suitably dis osed a plurality" of ear pieces 22, provide with the usual covered wire connections 23 and the radio 'set metallic con nections 24.

It will beobserved that my novel sound amplifying device serves to dis ense with the necessity. of holding or the c amping of the ear pieces to the'head' of those seeking to be entertained by the-radio method, which holdin or clamping is annoying and objectionab e to many, while it also serves to so augment and qualify the" sound that it may be distinctly heard in allparts of a room in a clear, non-metallic,-, unobstructed and natural pleasing tone, thereby furnishing the desired entertainment to-those in the room while they are emplo'yed in their'.o r dinary duties or pursuits, and at the same time a high degree of amplification as well as accuracy of reproduction is obtained-.

tracted neck portion of the device'is sufiiciently large to permit the hand to pass therethrough in order to suitably andloose Itwill also be understoodthat the con- ,ly dispose a plurality of ear pieces'within sound amplifierof the character described,

comprising an independent and disconnected structure formed with a horizontally positioned hollow circular body member having a solid imperforate concavoconvex rearend deflecting wall, a smooth, em )ty and unobstructed circular interior suriace extending throughoutits length, an open front portion of sufiicient area to permit the insertion of loosely placed acoustic receivers therein,

saidnjf struments being so disposed within said circular interior as to allow the sound waves to freely emanate therefrom and to cause the sound emanating from the structure to be amplified by said amplifier and a 1- supporting base.

2. Asa newarticle of manufacture, a sound amplifier of the character described, comprising an independent and disconnected unitary structure, formed entirely of glass having a hollow circular body portion masses 8 said instruments being so disposed with rela'tion to the circular interior as to allow the sound \va es to'freely emanate therefrom and to cause the sound emanatingv from the 10- structure to be-amplified by said amplifier,

and a supporting member connected thereto.

HERMAN P. PORTER. 

